David Pierce at The Verge:
Home is a family of Facebook apps that overhauls your entire device, turning it into a Facebook phone. An app called Coverfeed overhauls the homescreen and the lockscreen, giving you updates on what your friends are doing without you having to launch an app, or even unlock your phone — and you’ll get ads in all the same places. You can comment or like posts from your homescreen — it feels incredibly native. Everything is full-screen and incredibly visual, really looking nothing like Android.
Sounds like this solves the problem of people using their phones and sometimes seeing things that are not on Facebook.